you actually use -enabledeveloperconsole. Add this to the properties/launch options for STEAM users and to the end of the shortcut under properties/shortcut for non-steam users. Then during the game, press ~ to activate the console. Most of you are probably accessing it and don't realize it. When you press ~, nothing appears until you start typing something. Then a bunch of characters will appear at the top of the screen. You have to type out the command, you can't copy and paste. You also won't be able to see what you are typing.